#include <stdio.h>

int a = 5, b = 10;

void modify() {
	a++;
	b--;
	printf("pos1:a=%d,b=%d\n",a,b); 
} 

main() {
	
	int a =6, b = 9;
	
	printf("pos2:a=%d,b=%d\n",a,b); 
	
	modify();
	
}
